Yard-Man 11A-108Q401 User Manual

Yard-Man 11A-108Q401

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IMPORTANT: Read safety rules and instructions carefully before operating equipment.

MTD PRODUCTS INC. P.O. BOX 368022 CLEVELAND, OHIO 44136-9722

20” Mulching

Push Mower

Model

11A-108Q401

PRINTED IN U.S.A.

Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved forest-

covered, brush-covered or grass-covered land unless the engine’s exhaust system is equipped with a spark arrester meeting

applicable local or state laws (if any). If a spark arrester is used, it should be maintained in effective working order by the operator.

In the State of California the above is required by law (Section 4442 of the California Public Resources Code). Other states may have

similar laws. Federal laws apply on federal lands. A spark arrester for the muffler is available through your nearest engine authorized

service dealer or contact the service department, P.O. Box 368022 Cleveland, Ohio 44136-9722.

Operator’s Manual

FORM NO.

770-10328.fm

(11/99)

Table of Contents

Questions and Answers:

E
Elizabeth WatkinsAug 12, 2025
Why Yard-Man Lawn Mower engine fails to start?
- C
  charles01Aug 12, 2025
  If your Yard-Man Lawn Mower engine won't start, there are several potential causes: * The blade control handle might be disengaged. If so, engage the blade control handle. * The spark plug wire could be disconnected. Ensure it's connected to the spark plug. * The throttle control lever might not be in the correct starting position. Move it to the FAST or choke position. * The fuel tank could be empty or contain stale fuel. Refill with clean, fresh gasoline. * The fuel line might be blocked. Clean the fuel line. * The spark plug could be faulty. Clean, adjust the gap, or replace it. * The engine might be flooded. Crank the engine with the throttle in the FAST position.
M
Mr. Andrew Sanders VAug 16, 2025
Why does my Yard-Man 11A-108Q401 Lawn Mower engine run erratic?
- L
  Latoya MillerAug 16, 2025
  If your Yard-Man Lawn Mower engine is running erratically, consider these potential causes and solutions: * If the unit is running in the CHOKE position, move the throttle lever to the FAST position. * If the spark plug wire is loose, connect and tighten it. * If the fuel line is blocked or the fuel is stale, clean the fuel line and fill the tank with clean, fresh gasoline. * If the vent in the gas cap is plugged, clear it. * If there is water or dirt in the fuel system, drain the fuel tank. * If the air cleaner is dirty, clean it. * If the carburetor is out of adjustment, adjust it.
A
Austin PriceAug 19, 2025
How to fix Yard-Man Lawn Mower that idles poorly?
- T
  tmartinAug 19, 2025
  If your Yard-Man Lawn Mower idles poorly, here are some things to check: * The spark plug might be fouled, faulty, or have a gap that is too wide. Reset the gap to .030” or replace the spark plug. * The carburetor might be improperly adjusted. Adjust the carburetor. * The air cleaner might be dirty. Clean the air cleaner.
E
Edward OrtizAug 23, 2025
What to do if Yard-Man 11A-108Q401 Lawn Mower engine overheats?
- A
  Amanda EstesAug 23, 2025
  If your Yard-Man Lawn Mower engine overheats, check the following: * Ensure the engine oil level is adequate; if it's low, fill the crankcase with the proper oil. * Check for restricted airflow; if present, remove the blower housing and clean. * Verify that the carburetor is properly adjusted; if not, adjust the carburetor.
A
April WrightAug 27, 2025
What to do if Yard-Man Lawn Mower will not mulch grass?
- A
  Adrian CunninghamAug 27, 2025
  If your Yard-Man Lawn Mower isn't mulching grass effectively, consider these factors: * Ensure the engine speed is set high enough by setting the throttle to full throttle. * Avoid mowing wet grass; wait until it's dry. * If the grass is excessively high, mow once at a high cutting height, then mow again at the desired height, or make a narrower cutting swath (1/2 width). * Check if the blade is dull; if so, sharpen or replace it.
J
Jordan NguyenAug 30, 2025
Why Yard-Man Lawn Mower has excessive vibration?
- B
  banthonyAug 30, 2025
  If your Yard-Man Lawn Mower is vibrating excessively, check these potential issues: * The cutting blade might be loose or unbalanced. Tighten the blade and adapter. * The cutting blade might be bent. Balance or replace the blade.
K
Kristine MurphySep 3, 2025
How to fix uneven cut with Yard-Man Lawn Mower?
- S
  Sean KellySep 3, 2025
  If your Yard-Man Lawn Mower is producing an uneven cut, check the following: * Ensure all four wheels are in the same height position. * Check if the blade is dull; if so, sharpen or replace it.
K
Kathleen WilliamsSep 7, 2025
What causes Yard-Man Lawn Mower to skip at high speed?
- P
  Patricia JacksonSep 7, 2025
  If your Yard-Man Lawn Mower occasionally skips or hesitates at high speed, the spark plug gap may be too close. Adjust the gap to .030”.

Yard-Man 11A-108Q401 Specifications

General

Engine Displacement	140cc
Cutting Width	21 inches
Cutting Height	1.25 to 3.75 inches
Cutting Height Positions	6
Speed Settings	Variable
Warranty	2-year limited
Cutting Options	3-in-1 (Side Discharge, Mulch, Rear Bag)
Fuel Tank Capacity	0.5 gallons

Summary

Finding Model Number

Locating Model Information

Instructions on finding the mower's model and serial number.

Contacting Customer Support

Phone numbers and guidance for customer support inquiries.

Important Safe Operation Practices

General Operation Safety

Essential safety rules for operating the mower.

Slope Operation Safety

Guidelines for safe mowing on inclines and slopes.

Children Safety Guidelines

Precautions to ensure children's safety around the mower.

Service Safety Precautions

Safety measures before performing maintenance or repairs.

Operator Responsibilities

User's duties regarding safe equipment operation and maintenance.

Slope Gauge Guide

Using the Slope Gauge

How to use the page as a guide to determine safe mowing slopes.

Unit Setup and Assembly

Unpacking Your Lawn Mower

Steps to remove the mower from its carton and packaging.

Required Tools for Assembly

List of tools needed for assembling the mower.

Mower Assembly Steps

Instructions for assembling the mower handles and cables.

Know Your Lawn Mower

Blade Control Handle Function

Description of the safety feature that stops the blade.

Throttle Control Operation

How to use the throttle lever for engine speed and choke.

Recoil Starter Operation

Instructions on how to start the engine using the recoil starter.

Operating Your Lawn Mower

Gas and Oil Fill-Up Procedures

Instructions for safely adding fuel and oil to the mower.

Starting the Engine and Blade

Steps to start the mower's engine and engage the cutting blade.

Stopping the Engine and Blade

Procedures for safely shutting off the engine and blade.

Rotary Mower Usage Tips

Guidance on best practices for mowing grass effectively.

Making Adjustments and Service

Handle Height Adjustment

How to adjust the mower's handle position for comfort.

Cutting Height Adjustment

Steps to set the desired cutting height for the lawn.

Lubrication Points for Service

Areas requiring lubrication for proper mower function.

Maintaining Your Lawn Mower

Cutting Blade Maintenance

Instructions for removing, sharpening, and balancing the cutting blade.

Deck Maintenance

Cleaning the mower deck to prevent rust and corrosion.

Off-Season Storage Preparation

Manufacturer's Limited Warranty

Obtaining Warranty Service

How to get service and what proof is needed.

Warranty Exclusions and Limitations

Conditions not covered by the warranty and limitations.

State Law and Warranty Rights

Explanation of how state laws affect warranty coverage.

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